: The Cuddeback Letter Book contains approximately two-hundred letters sent to Charles Peirce between 1859 and 1861. In the front of the book Peirce compiled a list of sixty-one correspondents. Many of them are key figures in Peirce's life, and the Cuddeback has long been recognized as an important source for biographical research. However, some years ago the owner of the Cuddeback blocked scholarly access because of its fragile condition, among other reasons. Fortunately, the Cuddeback has recently been conserved and a digital image of each sheet has been made. This recent development is described below. Scholarly research on this area of Peirce's biography may now resume